JP2015519585A5

JP2015519585A5 -

Info

Publication number: JP2015519585A5
Application number: JP2015517343A
Authority: JP
Filing date: 2013-06-11
Publication date: 2016-07-28
Anticipated expiration: 2033-06-11

Claims

A system for sampling the exhaust produced by an engine,
A first signal that measures an exhaust flow rate of exhaust leaving the engine and generates a first signal that includes an exhaust flow component indicating the exhaust flow rate and a time stamp component of a first device associated with the first sampling. Equipment;
A second signal that measures a pollutant concentration and includes a pollutant concentration component indicative of the pollutant concentration and a second device time stamp component associated with a first sampling; and the first signal And a second device for generating a third signal influenced by the time stamp component of the second device; and
Receiving and processing the first signal, the second signal, and the third signal, and determining a temporal relationship between the first signal and the second signal of the first signal; A synchronization module that determines an exhaust flow component and a time stamp component of the first device by comparing the third signal and a time stamp component of the second device of the third signal.

The synchronization module of claim 1, wherein the synchronization module determines a time shift value that separates a time stamp of the first device of the first signal and a time stamp of the second device of the third signal. system.

The synchronization module equates the temporal relationship between the first signal and the second signal with the time shift value between the first signal and the third signal. Item 3. The system according to Item 2.

The synchronization module performs time synchronization between the first signal and the second signal by subtracting the time shift value from the time stamp component of the first device of the first signal, thereby synchronizing 4. The system of claim 3, wherein the system generates a synchronized first signal having a controlled exhaust flow component.

The synchronization module calculates a pollutant mass flow rate by calculating a product of the synchronized exhaust flow component of the synchronized first signal and the contaminant concentration component of the second signal. The system according to claim 4.

The first instrument measures the exhaust flow rate at different times during a test interval and generates a first array including a plurality of data pairs spaced by a first time scale; The system of claim 1, wherein each data pair of the array indicates the exhaust flow rate and a time stamp of the first device.

The second instrument measures the contaminant concentration at different times during the test interval and generates a second array including a plurality of data pairs spaced by a second time scale; 7. The system of claim 6, wherein each data pair in the second array indicates the contaminant concentration and a time stamp of the second instrument.

The second instrument measures the third signal at different times during the test interval and generates a third array including a plurality of data pairs spaced by a second time scale; The system of claim 6, wherein each data pair of the third array indicates the affected signal and a time stamp of the second device.

The synchronization module determines a temporal relationship between the first array and the second array by comparing the first array and the second array; and , Converting to the second time scale based on the temporal relationship between the first array and the second array, thereby generating a synchronized first array and the synchronized 9. The system of claim 8, wherein a contaminant mass flow rate for different times during the test interval is calculated by calculating a product of a first array and the second array.

An exhaust sampling system signal synchronization method comprising:
Detecting a first signal from a first device, wherein the first signal includes an exhaust flow component indicating an exhaust flow rate from the engine and a first device associated with the first sampling; Including a time stamp component;
A step of detecting a second signal from the second device, wherein the second signal is used for the first sampling and a pollutant concentration component indicating a pollutant concentration in the exhaust gas in the second device; An associated second device time stamp component;
Detecting a third signal from the second device, wherein the third signal is associated with the exhaust flow rate in the first device and the third signal. Steps affected by the time stamp component of the device; and
The time relationship between the first signal and the second signal is the time relationship between the exhaust flow component of the first signal and the time stamp component of the first device, and the third signal and the third signal. Determining by comparing with a time stamp component of said second device of the signal.

11. The method of claim 10 , further comprising: determining a time shift value that separates a time stamp of the first device of the first signal and a time stamp of the second device of the third signal. .

The method further comprises identifying the temporal relationship between the first signal and the second signal with the time shift value between the first signal and the third signal. 11. The method according to 11 .

By subtracting the time shift value from the time stamp component of the first device of the first signal, the time synchronization of the first signal and the second signal is performed, and the synchronized exhaust flow component 13. The method of claim 12 , further comprising generating a synchronized first signal having:

Further comprising calculating a pollutant mass flow by calculating a product of the synchronized exhaust flow component of the synchronized first signal and the pollutant concentration component of the second signal. Item 14. The method according to Item 13 .

Related to the first signal and the third signal;

Integrating the mathematical simultaneity function represented by
Changing the first signal and the third signal from a domain-based time to a domain-based frequency;

Applying a Fourier transform represented by: to the first signal and the third signal;
Multiplying the complex conjugate of the first signal and the third signal to produce a product of signals for frequencies based on the domain;
Converting the product of the signal from a frequency based on the domain to a time based on the domain;

Generating a lag function as defined by; and
Identify the peak of the lag function,

Determining the time shift value represented by:
By identifying a time lag between the first signal and the third signal,
Cutting off portions of the first signal and the third signal relating to the frequency based on the domain that are less than a predetermined lower limit to remove low-frequency fluctuations resulting from changes in ambient air pressure;
15. The method of claim 14 , further comprising:

14. Repeating the method steps of claim 13 a second time separated from the first by a predetermined number of time units to determine a test interval;
Sampling the first signal at different times during the test interval to produce a first array comprising a plurality of data pairs spaced by a first time scale, each data pair comprising: Indicates the exhaust flow from the engine and the corresponding first equipment time stamp;
Sampling the second signal at different times during the test interval to generate a second array comprising a plurality of data pairs spaced by a second time scale, each data pair comprising: Shows the pollutant concentration of the exhaust in the second device and the corresponding second device time stamp;
Sampling the third signal at different times during the test interval to generate a third array comprising a plurality of data pairs spaced by the second time scale, wherein each data A pair indicating a filter flow rate of exhaust in the second device and a corresponding time stamp of the second device;
Determining a temporal relationship between the first array and the second array by comparing the first array and the second array;
Converting the first array to the second time scale based on a temporal relationship between the first array and the second array to generate a synchronized first array; and ,
14. The method of claim 13 , further comprising calculating contaminant mass flow rates for different times during the test interval by calculating a product of the synchronized first array and the second array. the method of.

The first array and the third array;

Determining as two successive time functions represented by:
The first array;

By converting to the second time scale by solving
The method of claim 16 , further comprising timing the first array with the third array.